Gina Miller

Miller has the resources and money to pick another fight.

She took the British government to court to force May to consult parliament before triggering Article 50 and has said she is willing to challenge the government again if parliament is not given a final vote on leaving the EU.

PARTY: No party

POSITION: Businesswoman

MP SINCE: Not an MP

REMAINIAC OR BREXTREMIST? Remain

Return to the full list of 40 Brexit troublemakers to discover who to watch as legislation disentangling Britain from the European Union goes through the U.K. parliament. For an explanation of how this list was compiled, see here.